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Kihwal Lee edited comment on HDFS-9620 at 1/11/16 7:00 PM:
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For readers, a new block token is acquired by calling {{getBlockLocations()}}. Writers get
a block from {{addBlock()}} and it cannot be called multiple times for the same block. Can
we make a change to {{addBlock()}} to support it while maintaining compatibility? Or will
it be better to add a new method to the protocol?
was (Author: kihwal):
For readers, a new block token is acquired by calling {{getBlockLocations()}}. Writers get
a block from {{addBlock()}} and it cannot be called multiple times. Can we make a change
to {{addBlock()}} to support it while maintaining compatibility? Or will it be better to add
a new method to the protocol?
> Slow writer may fail permanently if pipeline breaks.
> ----------------------------------------------------
>
> Key: HDFS-9620
> URL: https://issues.apache.org/jira/browse/HDFS-9620
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client, security
> Reporter: Kihwal Lee
> Priority: Critical
>
> During a block write to a datanode, if the block write time exceed the block token expiration,
the client will not be able to reestablish a block output stream. E.g. if a node in the pipeline
dies, the pipeline recovery won't work.
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